US20050011833A1 - Apparatus for extracorporeal blood treatment with a device for checking a sterile filter, and method of checking a sterile filter of an extracorporeal blood treatment apparatus - Google Patents
Apparatus for extracorporeal blood treatment with a device for checking a sterile filter, and method of checking a sterile filter of an extracorporeal blood treatment apparatus Download PDFInfo
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- US20050011833A1 US20050011833A1 US10/877,189 US87718904A US2005011833A1 US 20050011833 A1 US20050011833 A1 US 20050011833A1 US 87718904 A US87718904 A US 87718904A US 2005011833 A1 US2005011833 A1 US 2005011833A1
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- dialysis fluid
- sterile filter
- property
- chamber
- dialysis
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- 238000011282 treatment Methods 0.000 title claims abstract description 33
- 239000008280 blood Substances 0.000 title claims abstract description 31
- 210000004369 blood Anatomy 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 14
- 239000000385 dialysis solution Substances 0.000 claims abstract description 164
- 239000000126 substance Substances 0.000 claims abstract description 26
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 15
- 230000000704 physical effect Effects 0.000 claims abstract description 4
- 239000012141 concentrate Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 4
- 244000005700 microbiome Species 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000000977 initiatory effect Effects 0.000 abstract 1
- 238000000502 dialysis Methods 0.000 description 13
- 239000012530 fluid Substances 0.000 description 9
- 239000013505 freshwater Substances 0.000 description 5
- 238000006467 substitution reaction Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000000108 ultra-filtration Methods 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000036512 infertility Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000001631 haemodialysis Methods 0.000 description 2
- 230000000322 hemodialysis Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000017531 blood circulation Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
- A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
- A61M1/1654—Dialysates therefor
- A61M1/1656—Apparatus for preparing dialysates
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
- A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
- A61M1/1601—Control or regulation
- A61M1/1613—Profiling or modelling of patient or predicted treatment evolution or outcome
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
- A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
- A61M1/1601—Control or regulation
- A61M1/1617—Control or regulation using measurements made during a temporary variation of a characteristic of the fresh dialysis fluid
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
- A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
- A61M1/1654—Dialysates therefor
- A61M1/1656—Apparatus for preparing dialysates
- A61M1/1672—Apparatus for preparing dialysates using membrane filters, e.g. for sterilising the dialysate
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/60—General characteristics of the apparatus with identification means
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/70—General characteristics of the apparatus with testing or calibration facilities
Definitions
- the invention relates to an apparatus for extracorporeal blood treatment, with a device for checking a sterile filter which is arranged in a dialysis fluid circuit of the blood treatment apparatus.
- the invention further relates to a method of checking a sterile filter, arranged in a dialysis fluid circuit of an apparatus for extracorporeal blood treatment, before the start of the extracorporeal blood treatment.
- substitution fluid In hemodiafiltration, it is known to produce a substitution fluid on-line from a dialysis fluid.
- the substitution fluid in particular should satisfy the stringent requirements concerning sterility.
- known blood treatment apparati contain sterile filters, which can be replaced after one use or after they have been used several times.
- European Patent No. EP 0 930 080 A1 describes a blood treatment apparati which has a first sterile filter for producing a sterile dialysis fluid from fresh water and from a dialysis fluid concentrate, and a second sterile filter for producing a sterile substitution fluid from the dialysis fluid. Both sterile filters are arranged in the dialysis fluid circuit upstream of the dialyzer and are flushed with the dialysis fluid.
- a further object of the invention is to provide a method which permits checking a sterile filter of an extracorporeal blood treatment apparatus and which requires only relatively little outlay in terms of equipment.
- a sterile filter is checked based on determining the time interval between a change in a physical and/or chemical property of the dialysis fluid, initiated in the dialysis fluid circuit upstream of the sterile filter, and the detection of the change in the property of the dialysis fluid in the dialysis fluid circuit downstream of the sterile filter. From the length of the determined time interval, it is then concluded whether the blood treatment apparatus is fitted with a sterile filter. For this purpose, the length of the determined time interval is compared to one or more predefined reference values which are representative of one sterile filter or of various sterile filters of different configurations.
- a parameter correlating with the time interval for example the balance chamber cycles, can also be evaluated if the blood treatment apparatus has a balance device with balance chambers.
- an impulse-type change in the physical and/or chemical properties of the dialysis fluid initiated upstream of the sterile filter requires a shorter propagation time in order to be able to be detected downstream of the sterile filter than if the blood treatment apparatus is fitted with a sterile filter. This may be attributed to the different volume of dialysis fluid in the predefined section of the dialysis fluid circuit, without or with sterile filter.
- One advantage of an apparatus according to one embodiment of the present invention and of the method according to one embodiment of the invention is that additional sensors on the sterile filter itself may not be necessary. Thus, the outlay in terms of equipment may be reduced.
- Checking of the sterile filter can be carried out before the actual dialysis treatment. The treatment thus may begin when it has been ascertained that the blood treatment apparatus is fitted with the sterile filter.
- the sterile filter it may be immaterial whether the dialysis fluid, whose chemical and/or physical property is changed, flows through only the first chamber or the second chamber or through both chambers. For this reason, the sterile filter can also be checked when it is connected into the circuit only for tangential flushing.
- the physical and/or chemical property of the dialysis fluid can be any parameter which is detectable in the dialysis fluid.
- the physical and/or chemical property is preferably the concentration of a defined substance in the dialysis fluid.
- the physical and/or chemical property can also be, for example, the temperature, density or pressure.
- the measurement of the concentration of a defined substance in the dialysis fluid, for example Na is preferably done by measuring the electrical conductivity of the dialysis fluid. In measuring the conductivity, it is advantageous that use can be made of conductivity sensors already provided in the dialysis fluid circuit of the blood treatment apparatuses.
- the physical and/or chemical property of the dialysis fluid may be changed, not constantly, but instead only for brief periods.
- the property of the dialysis fluid is preferably changed abruptly only for a short time interval.
- the change in the physical and/or chemical property of the dialysis fluid is effected by changing the mixing ratio of water and concentrate(s), preferably only for a short time, during preparation of the dialysis fluid.
- the apparatus and method according to the invention also make the checking of whether the blood treatment apparatus is fitted with a sterile filter of the correct size.
- Checking the size of the sterile filter is preferably done by determining the volume of dialysis fluid which flows through the predefined section of the dialysis fluid circuit until the change in the physical and/or chemical property of the dialysis fluid can be detected. This volume is dependent on the volume of the sterile filter through which dialysis fluid flows in the predefined section of the dialysis fluid circuit. Comparison of the determined volume and predefined reference values, which are representative of the various types of sterile filters of different size, permits identification of the respective sterile filter.
- fluid may be balanced against used dialysis fluid.
- the balance device may have at least one balance chamber in which, in successive balance chamber cycles, a predetermined amount of dialysis fluid is conveyed in each case.
- the volume of dialysis fluid is advantageously determined from the number of balance chamber cycles and from the predetermined amount of dialysis fluid.
- FIG. 1 shows a very much simplified, diagrammatic representation of the main structural components of a hemodialysis apparatus with a device for checking the sterile filter, according to one embodiment of the present invention
- FIG. 2 shows the conductivity of the dialysis fluid as a function of time, with and without sterile filter, according to one embodiment of the present invention.
- FIG. 1 the main structural components of a hemodialysis apparatus according of one embodiment are shown in a simplified diagrammatic representation.
- the dialysis apparatus has a dialyzer 1 which is divided by a semipermeable membrane 2 into a first chamber 3 , through which dialysis fluid flows, and a second chamber 4 through which blood flows.
- the first chamber 3 is coupled into a dialysis fluid circuit 5 , which has a dialysis fluid admission line 6 and a dialysis fluid discharge line 7 , while the second chamber of the dialyzer 1 is coupled into a blood circuit 8 .
- the dialysis fluid admission line 6 of the dialysis fluid circuit 5 has a first line section 9 and a second line section 10 .
- the first line section 9 connects a device 11 , for preparing dialysis fluid, to the inlet of a first chamber 12 of a sterile filter 15 which is divided into the first chamber 12 and a second chamber 14 by a membrane 13 that filters microorganisms.
- the second admission section 10 connects the outlet of the second chamber 14 of the sterile filter 15 to the inlet of the first chamber 3 of the dialyzer.
- the outlet of the first chamber 3 of the dialyzer 1 is connected to an outflow 16 via the dialysis fluid discharge line 7 .
- the device 11 for preparing fresh dialysis fluid has a fresh-water source 11 a and two dialysis fluid concentrate sources 11 b and 11 c .
- the water source 11 a is connected via a water line 11 d , and the concentrate sources 11 b , 11 c via concentrate lines 11 e and 11 f , to a mixing point M from which the dialysis fluid admission line 9 issues.
- Proportioning pumps P 1 , P 2 and P 3 are coupled into the water and concentrate lines, the flow rates of the pumps being used to set the mixing ratio of water and concentrates for mixing the dialysis fluid.
- a balance device 18 in employed which is designed as a balance chamber and which has first and second subsidiary chambers 17 , 19 .
- the first subsidiary chamber 17 is coupled into the first line section 9 of the dialysis fluid admission line 6
- the second subsidiary chamber 19 is coupled into the dialysis fluid discharge line 7 .
- a dialysis fluid pump 20 is coupled into the dialysis fluid discharge line.
- a second balance chamber operating in counter-phase may be used parallel to the first balance chamber 18 in order to permit an almost continuous flow. For reasons of clarity, however, the second balance chamber has not been shown.
- a first bypass line 21 From the outlet of the first chamber 12 of the sterile filter 15 , a first bypass line 21 , into which a first bypass valve 22 is coupled, leads to the dialysis fluid discharge line 7 upstream of the dialysis fluid pump 20 .
- a first shut-off member 23 is arranged upstream of the dialyzer 1 in the second line section 10 of the dialysis fluid admission line 6
- a second shut-off member 24 is arranged downstream of the dialyzer in the dialysis fluid discharge line 7 .
- a second bypass line 25 into which a second bypass valve 26 is coupled, connects the second line section 10 of the dialysis fluid admission line 6 upstream of the first shut-off member 23 to the dialysis fluid discharge line 7 downstream of the second shut-off member 24 .
- a device 28 for measuring the conductivity of the dialysis fluid is coupled into the dialysis fluid discharge line 7 downstream of the first and second bypass lines 21 , 25 and downstream of the dialysis fluid pump 20 .
- an ultrafiltration line 46 branches off from the dialysis fluid discharge line 7 and opens into the dialysis fluid discharge line downstream of the second subsidiary chamber 19 .
- An ultrafiltration pump 45 is coupled into the ultrafiltration line 46 .
- the blood circuit 8 has an admission line 29 coming from the patient and connected to the inlet of the second chamber 4 of the dialyzer 1 .
- the outlet of the second chamber 4 of the dialyzer 1 leads to the patient via a blood discharge line 30 to which a drip chamber 31 is connected.
- the dialysis apparatus also has a central control unit 34 which, via control lines (not shown), controls the dialysis fluid pump and ultrafiltration pump 20 , 45 , the proportioning pumps P 1 , P 2 , P 3 , the shut-off members 22 , 23 , 24 and 26 , and the balance device 18 .
- the first and second shut-off members 23 , 24 are opened and the first and second bypass valves 22 , 26 are closed, so that dialysis fluid flows from the device 11 , for preparing dialysis fluid, via the first subsidiary chamber 17 of the balance device 18 and via the sterile filter 15 into the first subsidiary chamber 3 of the dialyzer. From the first chamber of the dialyzer, the dialysis fluid then flows to the outflow 16 via the second subsidiary chamber 19 of the balance device 18 .
- the sterile filter 15 provides for sterile dialysis fluid to reach the dialyzer 1 .
- the first and second shut-off members 23 , 24 are closed and the first bypass valve 22 is opened, so that the dialysis fluid runs off directly into the outflow 16 .
- the second bypass valve 26 With the second bypass valve 26 opened, the second bypass line 25 serves to circumvent the dialyzer after flushing mode with the first and second shut-off members 23 , 24 closed.
- the dialysis fluid flows directly into the outflow 16 .
- the sterile filter 15 may be used one or more times and can be replaced while the lines are disconnected.
- a device 35 for checking the sterile filter determines that the dialysis apparatus is fitted with a sterile filter at the start of the actual dialysis treatment.
- the device 35 for checking the sterile filter 15 has a computing unit 36 which is connected via a data line 37 to the central control unit 34 and via a data line 40 to an alarm unit 38 , which emits an acoustic and/or visual alarm.
- the alarm unit 38 is in turn connected via a data line 39 to the control unit 34 which, in the event of an alarm, interrupts the routine of preparing for the dialysis treatment in order to fit the dialysis machine with a sterile filter.
- the device 35 checks the sterile filter in the following way:
- the dialysis fluid circuit 6 is flushed with fresh water.
- the proportioning pump P 1 is in operation, not the pumps P 2 and P 3 .
- one of the two pumps P 2 and P 3 is triggered briefly to generate a concentrate bolus, which can be detected as a conductivity impulse in the dialysis fluid.
- This conductivity impulse propagates through the dialysis fluid admission line 6 (which includes the sterile filter 15 ), the dialyzer 1 and the dialysis fluid discharge line 7 until it reaches the device 28 for measuring the conductivity of the dialysis fluid and is detected.
- the computing unit 36 is configured to determine the time interval ⁇ t between the first time, at which the conductivity impulse is generated by the device 11 for preparing the dialysis fluid, and the second time, at which the conductivity impulse is detected by the device 28 for measuring the conductivity.
- the computing unit 36 is also configured to compare the length of the time interval ⁇ t to predefined reference values which are representative of the sterile filters 15 used.
- the time t, at which the measurement starts, can be defined by any desired signals associated with the development of the change in the property, for example the conductivity impulse.
- a further conductivity sensor can be provided for detection of the conductivity impulse at a certain point on the measurement length to the time of the start of the measurement.
- FIG. 2 shows the conductivity of the dialysis fluid as a function of time, the time axis being given in balance chamber cycles. Since the balance device 19 , in successive balance chamber cycles, delivers in each case a predetermined amount of dialysis fluid, there may be a fixed predefined relationship between the volume of dialysis fluid delivered and the number of balance chamber cycles.
- a dialysis fluid flow rate of 500 ml/min has been set, with a balance chamber cycle of 3.3 seconds duration.
- a balance chamber filling is 30 m/l.
- 15 balance chamber cycles correspond to a time shift of 49.5 seconds and a volume difference of 450 ml.
- the number of balance chamber cycles corresponding to the time shim is compared to a predefined reference value lying between 40 and 55 balance chamber cycles, for example 50 balance chamber cycles.
- the computing unit 36 sends an alarm signal to the alarm unit 38 , which emits an acoustic and/or visual alarm and, via the control unit, interrupts the routine of preparing for the dialysis treatment.
- the time shift ⁇ t may be dependent on the volume of the dialysis fluid flowing through the predefined section of the dialysis fluid circuit that includes the sterile filter.
- a sterile filter with a greater volume may consequently cause a greater time shift than a sterile filter with a smaller volume.
- the computing unit compares the time shift to predefined limit values which are each characteristic of a sterile filter with a specified volume. If the time shift is greater than the respective characteristic limit value, it may be concluded that the respective sterile filter is used.
- the sterile filter 15 may be checked both with fluid flowing through the dialyzer 1 and also with fluid flowing through the first or second bypass line 21 , 25 , because the device 28 for measuring the conductivity is arranged downstream of the first and second bypass lines 21 , 25 .
- the device 28 can also be arranged in the second section of the dialysis fluid admission line 10 . Then, however, it may be difficult to check the sterile filter with fluid flowing through the first bypass line 21 .
- the predefined volume enclosed by the sterile filter in such an arrangement of the device 28 is smaller, because part of the dialysis fluid admission and discharge lines is omitted.
- the reference values to be used may change.
Abstract
Description
- The invention relates to an apparatus for extracorporeal blood treatment, with a device for checking a sterile filter which is arranged in a dialysis fluid circuit of the blood treatment apparatus. The invention further relates to a method of checking a sterile filter, arranged in a dialysis fluid circuit of an apparatus for extracorporeal blood treatment, before the start of the extracorporeal blood treatment.
- It is known to produce a dialysis fluid on-line from fresh water and one or more concentrates. The fresh water generally contains no microorganisms and the concentrates are normally sterile, but it is nevertheless difficult to guarantee that the dialysis fluid produced on-line always meets the very stringent sterility requirements imposed in extracorporeal blood treatments.
- In hemodiafiltration, it is known to produce a substitution fluid on-line from a dialysis fluid. The substitution fluid in particular should satisfy the stringent requirements concerning sterility.
- In order to enable the sterility of the dialysis fluid and substitution fluid, known blood treatment apparati contain sterile filters, which can be replaced after one use or after they have been used several times. European Patent No.
EP 0 930 080 A1 describes a blood treatment apparati which has a first sterile filter for producing a sterile dialysis fluid from fresh water and from a dialysis fluid concentrate, and a second sterile filter for producing a sterile substitution fluid from the dialysis fluid. Both sterile filters are arranged in the dialysis fluid circuit upstream of the dialyzer and are flushed with the dialysis fluid. - In practice it is desirable that a sterile filter provided for a blood treatment apparatus is actually fitted in the apparatus. Otherwise there is a risk that the dialysis fluid and/or substitution fluid may not be sterile. Automatic detection of whether the apparatus is fitted with a filter typically requires additional equipment and costs.
- It is therefore an object of the invention to provide an apparatus for extracorporeal blood treatment which permits checking of the sterile filter with relatively little additional equipment. A further object of the invention is to provide a method which permits checking a sterile filter of an extracorporeal blood treatment apparatus and which requires only relatively little outlay in terms of equipment.
- According to one embodiment of the present invention, a sterile filter is checked based on determining the time interval between a change in a physical and/or chemical property of the dialysis fluid, initiated in the dialysis fluid circuit upstream of the sterile filter, and the detection of the change in the property of the dialysis fluid in the dialysis fluid circuit downstream of the sterile filter. From the length of the determined time interval, it is then concluded whether the blood treatment apparatus is fitted with a sterile filter. For this purpose, the length of the determined time interval is compared to one or more predefined reference values which are representative of one sterile filter or of various sterile filters of different configurations. In another embodiment, instead of a time interval, a parameter correlating with the time interval, for example the balance chamber cycles, can also be evaluated if the blood treatment apparatus has a balance device with balance chambers.
- If the blood treatment apparatus is not fitted with a sterile filter, e.g., the connection terminals of the sterile filter are bridged by a tube line, an impulse-type change in the physical and/or chemical properties of the dialysis fluid initiated upstream of the sterile filter requires a shorter propagation time in order to be able to be detected downstream of the sterile filter than if the blood treatment apparatus is fitted with a sterile filter. This may be attributed to the different volume of dialysis fluid in the predefined section of the dialysis fluid circuit, without or with sterile filter.
- One advantage of an apparatus according to one embodiment of the present invention and of the method according to one embodiment of the invention is that additional sensors on the sterile filter itself may not be necessary. Thus, the outlay in terms of equipment may be reduced. Checking of the sterile filter can be carried out before the actual dialysis treatment. The treatment thus may begin when it has been ascertained that the blood treatment apparatus is fitted with the sterile filter. For checking the sterile filter, it may be immaterial whether the dialysis fluid, whose chemical and/or physical property is changed, flows through only the first chamber or the second chamber or through both chambers. For this reason, the sterile filter can also be checked when it is connected into the circuit only for tangential flushing.
- The physical and/or chemical property of the dialysis fluid can be any parameter which is detectable in the dialysis fluid. The physical and/or chemical property is preferably the concentration of a defined substance in the dialysis fluid. However, the physical and/or chemical property can also be, for example, the temperature, density or pressure. The measurement of the concentration of a defined substance in the dialysis fluid, for example Na, is preferably done by measuring the electrical conductivity of the dialysis fluid. In measuring the conductivity, it is advantageous that use can be made of conductivity sensors already provided in the dialysis fluid circuit of the blood treatment apparatuses.
- To check the sterile filter, it may be sufficient for the physical and/or chemical property of the dialysis fluid to be changed, not constantly, but instead only for brief periods. The property of the dialysis fluid is preferably changed abruptly only for a short time interval. In a particularly preferred embodiment of the invention, the change in the physical and/or chemical property of the dialysis fluid is effected by changing the mixing ratio of water and concentrate(s), preferably only for a short time, during preparation of the dialysis fluid.
- In addition to checking that the blood treatment apparatus is fitted with a sterile filter, the apparatus and method according to the invention also make the checking of whether the blood treatment apparatus is fitted with a sterile filter of the correct size. Checking the size of the sterile filter is preferably done by determining the volume of dialysis fluid which flows through the predefined section of the dialysis fluid circuit until the change in the physical and/or chemical property of the dialysis fluid can be detected. This volume is dependent on the volume of the sterile filter through which dialysis fluid flows in the predefined section of the dialysis fluid circuit. Comparison of the determined volume and predefined reference values, which are representative of the various types of sterile filters of different size, permits identification of the respective sterile filter.
- In a blood treatment apparatus having a balance device fresh dialysis, fluid may be balanced against used dialysis fluid. The balance device may have at least one balance chamber in which, in successive balance chamber cycles, a predetermined amount of dialysis fluid is conveyed in each case. In this arrangement, the volume of dialysis fluid is advantageously determined from the number of balance chamber cycles and from the predetermined amount of dialysis fluid.
- One embodiment of the invention is explained in more detail below with reference to the drawings, in which:
-
FIG. 1 shows a very much simplified, diagrammatic representation of the main structural components of a hemodialysis apparatus with a device for checking the sterile filter, according to one embodiment of the present invention; and -
FIG. 2 shows the conductivity of the dialysis fluid as a function of time, with and without sterile filter, according to one embodiment of the present invention. - In
FIG. 1 , the main structural components of a hemodialysis apparatus according of one embodiment are shown in a simplified diagrammatic representation. The dialysis apparatus has adialyzer 1 which is divided by asemipermeable membrane 2 into a first chamber 3, through which dialysis fluid flows, and asecond chamber 4 through which blood flows. The first chamber 3 is coupled into adialysis fluid circuit 5, which has a dialysisfluid admission line 6 and a dialysisfluid discharge line 7, while the second chamber of thedialyzer 1 is coupled into ablood circuit 8. - The dialysis
fluid admission line 6 of thedialysis fluid circuit 5 has a first line section 9 and asecond line section 10. The first line section 9 connects adevice 11, for preparing dialysis fluid, to the inlet of afirst chamber 12 of asterile filter 15 which is divided into thefirst chamber 12 and asecond chamber 14 by amembrane 13 that filters microorganisms. Thesecond admission section 10 connects the outlet of thesecond chamber 14 of thesterile filter 15 to the inlet of the first chamber 3 of the dialyzer. The outlet of the first chamber 3 of thedialyzer 1 is connected to anoutflow 16 via the dialysisfluid discharge line 7. - The
device 11 for preparing fresh dialysis fluid has a fresh-water source 11 a and two dialysisfluid concentrate sources water source 11 a is connected via a water line 11 d, and theconcentrate sources concentrate lines - To balance fresh dialysis fluid against used dialysis fluid, a
balance device 18 in employed which is designed as a balance chamber and which has first andsecond subsidiary chambers first subsidiary chamber 17 is coupled into the first line section 9 of the dialysisfluid admission line 6, while thesecond subsidiary chamber 19 is coupled into the dialysisfluid discharge line 7. Upstream of the secondsubsidiary chamber 19, adialysis fluid pump 20 is coupled into the dialysis fluid discharge line. In practice, a second balance chamber operating in counter-phase may be used parallel to thefirst balance chamber 18 in order to permit an almost continuous flow. For reasons of clarity, however, the second balance chamber has not been shown. - From the outlet of the
first chamber 12 of thesterile filter 15, afirst bypass line 21, into which afirst bypass valve 22 is coupled, leads to the dialysisfluid discharge line 7 upstream of thedialysis fluid pump 20. A first shut-off member 23 is arranged upstream of thedialyzer 1 in thesecond line section 10 of the dialysisfluid admission line 6, and a second shut-off member 24 is arranged downstream of the dialyzer in the dialysisfluid discharge line 7. Asecond bypass line 25, into which asecond bypass valve 26 is coupled, connects thesecond line section 10 of the dialysisfluid admission line 6 upstream of the first shut-off member 23 to the dialysisfluid discharge line 7 downstream of the second shut-off member 24. - A
device 28 for measuring the conductivity of the dialysis fluid is coupled into the dialysisfluid discharge line 7 downstream of the first andsecond bypass lines dialysis fluid pump 20. Downstream of thefirst bypass line 21 and upstream of thedialysis fluid pump 20, anultrafiltration line 46 branches off from the dialysisfluid discharge line 7 and opens into the dialysis fluid discharge line downstream of thesecond subsidiary chamber 19. Anultrafiltration pump 45 is coupled into theultrafiltration line 46. - The
blood circuit 8 has anadmission line 29 coming from the patient and connected to the inlet of thesecond chamber 4 of thedialyzer 1. The outlet of thesecond chamber 4 of thedialyzer 1 leads to the patient via ablood discharge line 30 to which adrip chamber 31 is connected. - The dialysis apparatus also has a
central control unit 34 which, via control lines (not shown), controls the dialysis fluid pump andultrafiltration pump members balance device 18. - During the dialysis treatment, the first and second shut-off
members second bypass valves device 11, for preparing dialysis fluid, via thefirst subsidiary chamber 17 of thebalance device 18 and via thesterile filter 15 into the first subsidiary chamber 3 of the dialyzer. From the first chamber of the dialyzer, the dialysis fluid then flows to theoutflow 16 via thesecond subsidiary chamber 19 of thebalance device 18. Thesterile filter 15 provides for sterile dialysis fluid to reach thedialyzer 1. - For flushing the
sterile filter 15, the first and second shut-offmembers first bypass valve 22 is opened, so that the dialysis fluid runs off directly into theoutflow 16. With thesecond bypass valve 26 opened, thesecond bypass line 25 serves to circumvent the dialyzer after flushing mode with the first and second shut-offmembers outflow 16. - The
sterile filter 15 may be used one or more times and can be replaced while the lines are disconnected. Adevice 35 for checking the sterile filter determines that the dialysis apparatus is fitted with a sterile filter at the start of the actual dialysis treatment. Thedevice 35 for checking thesterile filter 15 has acomputing unit 36 which is connected via adata line 37 to thecentral control unit 34 and via adata line 40 to analarm unit 38, which emits an acoustic and/or visual alarm. Thealarm unit 38 is in turn connected via adata line 39 to thecontrol unit 34 which, in the event of an alarm, interrupts the routine of preparing for the dialysis treatment in order to fit the dialysis machine with a sterile filter. - During the routine of preparing for the dialysis treatment, the
device 35 checks the sterile filter in the following way: - First, the
dialysis fluid circuit 6 is flushed with fresh water. At this stage, only the proportioning pump P1 is in operation, not the pumps P2 and P3. Then one of the two pumps P2 and P3 is triggered briefly to generate a concentrate bolus, which can be detected as a conductivity impulse in the dialysis fluid. This conductivity impulse propagates through the dialysis fluid admission line 6 (which includes the sterile filter 15), thedialyzer 1 and the dialysisfluid discharge line 7 until it reaches thedevice 28 for measuring the conductivity of the dialysis fluid and is detected. - The
computing unit 36 is configured to determine the time interval Δt between the first time, at which the conductivity impulse is generated by thedevice 11 for preparing the dialysis fluid, and the second time, at which the conductivity impulse is detected by thedevice 28 for measuring the conductivity. Thecomputing unit 36 is also configured to compare the length of the time interval Δt to predefined reference values which are representative of thesterile filters 15 used. The time t, at which the measurement starts, can be defined by any desired signals associated with the development of the change in the property, for example the conductivity impulse. A further conductivity sensor can be provided for detection of the conductivity impulse at a certain point on the measurement length to the time of the start of the measurement. -
FIG. 2 shows the conductivity of the dialysis fluid as a function of time, the time axis being given in balance chamber cycles. Since thebalance device 19, in successive balance chamber cycles, delivers in each case a predetermined amount of dialysis fluid, there may be a fixed predefined relationship between the volume of dialysis fluid delivered and the number of balance chamber cycles. In the present example, a dialysis fluid flow rate of 500 ml/min has been set, with a balance chamber cycle of 3.3 seconds duration. In the present illustrative embodiment, a balance chamber filling is 30 m/l. Thus, for example, 15 balance chamber cycles correspond to a time shift of 49.5 seconds and a volume difference of 450 ml. -
FIG. 2 shows that the conductivity impulse initiated at the time t=0 can be detected at the time t=t1 after a time shift Δt of 132 s, corresponding to 40 balance chamber cycles, if the dialysis apparatus is not fitted with asterile filter 15. If the dialysis apparatus is fitted with asterile filter 15, the conductivity impulse is not detected until the time t=t1′ after 55 balance chamber cycles, i.e. 181.5 seconds. Here, the conductivity impulse is detected by detection of the abrupt rise in conductivity. - In the
computing unit 36, the number of balance chamber cycles corresponding to the time shim is compared to a predefined reference value lying between 40 and 55 balance chamber cycles, for example 50 balance chamber cycles. In the event that the determined time shift is smaller than the reference value, thecomputing unit 36 sends an alarm signal to thealarm unit 38, which emits an acoustic and/or visual alarm and, via the control unit, interrupts the routine of preparing for the dialysis treatment. - The time shift Δt may be dependent on the volume of the dialysis fluid flowing through the predefined section of the dialysis fluid circuit that includes the sterile filter. A sterile filter with a greater volume may consequently cause a greater time shift than a sterile filter with a smaller volume.
- To identify a sterile filter with a specified volume, the computing unit compares the time shift to predefined limit values which are each characteristic of a sterile filter with a specified volume. If the time shift is greater than the respective characteristic limit value, it may be concluded that the respective sterile filter is used.
- In the illustrative embodiments described, the
sterile filter 15 may be checked both with fluid flowing through thedialyzer 1 and also with fluid flowing through the first orsecond bypass line device 28 for measuring the conductivity is arranged downstream of the first andsecond bypass lines device 28 can also be arranged in the second section of the dialysisfluid admission line 10. Then, however, it may be difficult to check the sterile filter with fluid flowing through thefirst bypass line 21. On the other hand, the predefined volume enclosed by the sterile filter in such an arrangement of thedevice 28 is smaller, because part of the dialysis fluid admission and discharge lines is omitted. At the same time, the reference values to be used may change. When measuring via thebypass line 21, it may be noted in particular that dialysis fluid flows through one chamber of thesterile filter 15.
Claims (16)
Applications Claiming Priority (3)
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DE10328435.4 | 2003-06-25 | ||
DE10328435 | 2003-06-25 | ||
DE10328435A DE10328435B3 (en) | 2003-06-25 | 2003-06-25 | Device for extracorporeal blood treatment with a device for checking a sterile filter and method for checking a sterile filter of an extracorporeal blood treatment device |
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US20050011833A1 true US20050011833A1 (en) | 2005-01-20 |
US8182691B2 US8182691B2 (en) | 2012-05-22 |
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US (1) | US8182691B2 (en) |
EP (1) | EP1491222B1 (en) |
JP (1) | JP4406325B2 (en) |
AT (1) | ATE506088T1 (en) |
DE (2) | DE10328435B3 (en) |
ES (1) | ES2364138T3 (en) |
PL (1) | PL1491222T3 (en) |
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US8029454B2 (en) | 2003-11-05 | 2011-10-04 | Baxter International Inc. | High convection home hemodialysis/hemofiltration and sorbent system |
US20130292313A1 (en) * | 2006-11-15 | 2013-11-07 | Gambro Lundia Ab | Apparatus for extracorporeal blood treatment |
US9328969B2 (en) | 2011-10-07 | 2016-05-03 | Outset Medical, Inc. | Heat exchange fluid purification for dialysis system |
CN107866159A (en) * | 2016-09-26 | 2018-04-03 | B·布莱恩·阿维图姆股份公司 | Method and apparatus for being pre-mixed dialyzate |
CN109641095A (en) * | 2016-08-20 | 2019-04-16 | 费森尤斯医疗护理德国有限责任公司 | For providing the device and method and dialysis machine of dialysis liquid |
CN110225772A (en) * | 2016-11-25 | 2019-09-10 | 甘布罗伦迪亚股份公司 | Device for extracorporeal blood treatment |
US10994065B2 (en) * | 2016-01-15 | 2021-05-04 | Fresnius Medical Care Deutschland Gmbh | Apparatus for carrying out an extracorporeal blood treatment and method for adding a substitution fluid |
US11571501B2 (en) | 2018-04-25 | 2023-02-07 | Gambro Lundia Ab | Apparatus and method for testing integrity of an ultrafilter membrane |
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ATE434454T1 (en) | 2003-01-07 | 2009-07-15 | Nxstage Medical Inc | BATCH FILTRATION SYSTEM FOR PRODUCING A STERILE REPLACEMENT LIQUID FOR KIDNEY TREATMENTS |
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Also Published As
Publication number | Publication date |
---|---|
US8182691B2 (en) | 2012-05-22 |
EP1491222B1 (en) | 2011-04-20 |
DE10328435B3 (en) | 2005-03-24 |
ES2364138T3 (en) | 2011-08-25 |
PL1491222T3 (en) | 2011-09-30 |
DE502004012409D1 (en) | 2011-06-01 |
JP4406325B2 (en) | 2010-01-27 |
EP1491222A1 (en) | 2004-12-29 |
JP2005013735A (en) | 2005-01-20 |
ATE506088T1 (en) | 2011-05-15 |
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